Update min/max notification height for N

ui/message_center/views/custom_notification_view.cc

Index: ui/message_center/views/custom_notification_view.cc
diff --git a/ui/message_center/views/custom_notification_view.cc b/ui/message_center/views/custom_notification_view.cc
index 91b894673e90f13db892db6b1a47cf40f8714a49..e009bb856b3f1e529e99abc2db62bc99a8965fe5 100644
--- a/ui/message_center/views/custom_notification_view.cc
+++ b/ui/message_center/views/custom_notification_view.cc
@@ -81,7 +81,8 @@ gfx::Size CustomNotificationView::GetPreferredSize() const {
   const int contents_width = kNotificationWidth - insets.width();
   const int contents_height = contents_view_->GetHeightForWidth(contents_width);
 
-  constexpr int kMaxContentHeight = 256;
+  // This is union of max/min height for M (256-64) and N (284-92).
+  constexpr int kMaxContentHeight = 284;
   constexpr int kMinContentHeight = 64;
   return gfx::Size(kNotificationWidth,
                    std::max(kMinContentHeight + insets.height(),